netfilter: nf_tables: set names cannot be larger than 15 bytes

Currently, nf_tables trims off the set name if it exceeeds 15
bytes, so explicitly reject set names that are too large.

Reported-by: Giuseppe Longo <giuseppelng@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 33045a5..43ae487 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1946,7 +1946,8 @@ static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const
 
 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
        [NFTA_SET_TABLE]                = { .type = NLA_STRING },
-       [NFTA_SET_NAME]                 = { .type = NLA_STRING },
+       [NFTA_SET_NAME]                 = { .type = NLA_STRING,
+                                           .len = IFNAMSIZ - 1 },
        [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
        [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
        [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },